They taste distinctly different. I like spicy chicken sandwiches so I've tried a couple of these. Burger King's tastes like they just slapped a bunch of ingredients together and wrapped it up. McDonald's actually tastes and feels like a chicken sandwich. Popeye's has a very buttery mouth feel, and the bun is a lot more flavorful and rich.
I get what the meme is trying to say, but this is a poor example of it.